/* * Copyright (c) Contributors, http://opensimulator.org/ * See CONTRIBUTORS.TXT for a full list of copyright holders. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyrightD * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the OpenSimulator Project nor the * names of its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ using System; using System.Reflection; using System.Collections.Generic; using System.Xml; using log4net; using OMV = OpenMetaverse; using OpenSim.Framework; using OpenSim.Region.Physics.Manager; using OpenSim.Region.Physics.ConvexDecompositionDotNet; namespace OpenSim.Region.Physics.BulletSPlugin { [Serializable] public sealed class BSPrim : BSPhysObject { private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); private static readonly string LogHeader = "[BULLETS PRIM]"; // _size is what the user passed. Scale is what we pass to the physics engine with the mesh. private OMV.Vector3 _size; // the multiplier for each mesh dimension as passed by the user private bool _grabbed; private bool _isSelected; private bool _isVolumeDetect; private OMV.Vector3 _position; private float _mass; // the mass of this object private float _density; private OMV.Vector3 _force; private OMV.Vector3 _velocity; private OMV.Vector3 _torque; private float _collisionScore; private OMV.Vector3 _acceleration; private OMV.Quaternion _orientation; private int _physicsActorType; private bool _isPhysical; private bool _flying; private float _friction; private float _restitution; private bool _setAlwaysRun; private bool _throttleUpdates; private bool _isColliding; private bool _collidingGround; private bool _collidingObj; private bool _floatOnWater; private OMV.Vector3 _rotationalVelocity; private bool _kinematic; private float _buoyancy; private BSDynamics _vehicle; private OMV.Vector3 _PIDTarget; private bool _usePID; private float _PIDTau; private bool _useHoverPID; private float _PIDHoverHeight; private PIDHoverType _PIDHoverType; private float _PIDHoverTao; public BSPrim(uint localID, String primName, BSScene parent_scene, OMV.Vector3 pos, OMV.Vector3 size, OMV.Quaternion rotation, PrimitiveBaseShape pbs, bool pisPhysical) : base(parent_scene, localID, primName, "BSPrim") { // m_log.DebugFormat("{0}: BSPrim creation of {1}, id={2}", LogHeader, primName, localID); _physicsActorType = (int)ActorTypes.Prim; _position = pos; _size = size; Scale = size; // prims are the size the user wants them to be (different for BSCharactes). _orientation = rotation; _buoyancy = 0f; _velocity = OMV.Vector3.Zero; _rotationalVelocity = OMV.Vector3.Zero; BaseShape = pbs; _isPhysical = pisPhysical; _isVolumeDetect = false; // Someday set default attributes based on the material but, for now, we don't know the prim material yet. // MaterialAttributes primMat = BSMaterials.GetAttributes(Material, pisPhysical); _density = PhysicsScene.Params.defaultDensity; _friction = PhysicsScene.Params.defaultFriction; _restitution = PhysicsScene.Params.defaultRestitution; _vehicle = new BSDynamics(PhysicsScene, this); // add vehicleness _mass = CalculateMass(); // No body or shape yet PhysBody = new BulletBody(LocalID); PhysShape = new BulletShape(); Linkset.Refresh(this); DetailLog("{0},BSPrim.constructor,call", LocalID); // do the actual object creation at taint time PhysicsScene.TaintedObject("BSPrim.create", delegate() { CreateGeomAndObject(true); CurrentCollisionFlags = BulletSimAPI.GetCollisionFlags2(PhysBody.ptr); }); } // called when this prim is being destroyed and we should free all the resources public override void Destroy() { // m_log.DebugFormat("{0}: Destroy, id={1}", LogHeader, LocalID); base.Destroy(); // Undo any links between me and any other object BSPhysObject parentBefore = Linkset.LinksetRoot; int childrenBefore = Linkset.NumberOfChildren; Linkset = Linkset.RemoveMeFromLinkset(this); DetailLog("{0},BSPrim.Destroy,call,parentBefore={1},childrenBefore={2},parentAfter={3},childrenAfter={4}", LocalID, parentBefore.LocalID, childrenBefore, Linkset.LinksetRoot.LocalID, Linkset.NumberOfChildren); // Undo any vehicle properties this.VehicleType = (int)Vehicle.TYPE_NONE; PhysicsScene.TaintedObject("BSPrim.destroy", delegate() { DetailLog("{0},BSPrim.Destroy,taint,", LocalID); // If there are physical body and shape, release my use of same. PhysicsScene.Shapes.DereferenceBody(PhysBody, true, null); PhysBody.Clear(); PhysicsScene.Shapes.DereferenceShape(PhysShape, true, null); PhysShape.Clear(); }); } // No one uses this property. public override bool Stopped { get { return false; } } public override OMV.Vector3 Size { get { return _size; } set { // We presume the scale and size are the same. If scale must be changed for // the physical shape, that is done when the geometry is built. _size = value; Scale = _size; ForceBodyShapeRebuild(false); } } public override PrimitiveBaseShape Shape { set { BaseShape = value; ForceBodyShapeRebuild(false); } } // Whatever the linkset wants is what I want. public override BSPhysicsShapeType PreferredPhysicalShape { get { return Linkset.PreferredPhysicalShape(this); } } public override bool ForceBodyShapeRebuild(bool inTaintTime) { LastAssetBuildFailed = false; PhysicsScene.TaintedObject(inTaintTime, "BSPrim.ForceBodyShapeRebuild", delegate() { _mass = CalculateMass(); // changing the shape changes the mass CreateGeomAndObject(true); }); return true; } public override bool Grabbed { set { _grabbed = value; } } public override bool Selected { set { if (value != _isSelected) { _isSelected = value; PhysicsScene.TaintedObject("BSPrim.setSelected", delegate() { DetailLog("{0},BSPrim.selected,taint,selected={1}", LocalID, _isSelected); SetObjectDynamic(false); }); } } } public override void CrossingFailure() { return; } // link me to the specified parent public override void link(PhysicsActor obj) { BSPrim parent = obj as BSPrim; if (parent != null) { BSPhysObject parentBefore = Linkset.LinksetRoot; int childrenBefore = Linkset.NumberOfChildren; Linkset = parent.Linkset.AddMeToLinkset(this); DetailLog("{0},BSPrim.link,call,parentBefore={1}, childrenBefore=={2}, parentAfter={3}, childrenAfter={4}", LocalID, parentBefore.LocalID, childrenBefore, Linkset.LinksetRoot.LocalID, Linkset.NumberOfChildren); } return; } // delink me from my linkset public override void delink() { // TODO: decide if this parent checking needs to happen at taint time // Race condition here: if link() and delink() in same simulation tick, the delink will not happen BSPhysObject parentBefore = Linkset.LinksetRoot; int childrenBefore = Linkset.NumberOfChildren; Linkset = Linkset.RemoveMeFromLinkset(this); DetailLog("{0},BSPrim.delink,parentBefore={1},childrenBefore={2},parentAfter={3},childrenAfter={4}, ", LocalID, parentBefore.LocalID, childrenBefore, Linkset.LinksetRoot.LocalID, Linkset.NumberOfChildren); return; } // Set motion values to zero. // Do it to the properties so the values get set in the physics engine. // Push the setting of the values to the viewer. // Called at taint time! public override void ZeroMotion(bool inTaintTime) { _velocity = OMV.Vector3.Zero; _acceleration = OMV.Vector3.Zero; _rotationalVelocity = OMV.Vector3.Zero; // Zero some other properties in the physics engine PhysicsScene.TaintedObject(inTaintTime, "BSPrim.ZeroMotion", delegate() { if (PhysBody.HasPhysicalBody) BulletSimAPI.ClearAllForces2(PhysBody.ptr); }); } public override void ZeroAngularMotion(bool inTaintTime) { _rotationalVelocity = OMV.Vector3.Zero; // Zero some other properties in the physics engine PhysicsScene.TaintedObject(inTaintTime, "BSPrim.ZeroMotion", delegate() { // DetailLog("{0},BSPrim.ZeroAngularMotion,call,rotVel={1}", LocalID, _rotationalVelocity); if (PhysBody.HasPhysicalBody) { BulletSimAPI.SetInterpolationAngularVelocity2(PhysBody.ptr, _rotationalVelocity); BulletSimAPI.SetAngularVelocity2(PhysBody.ptr, _rotationalVelocity); } }); } public override void LockAngularMotion(OMV.Vector3 axis) { DetailLog("{0},BSPrim.LockAngularMotion,call,axis={1}", LocalID, axis); return; } public override OMV.Vector3 RawPosition { get { return _position; } set { _position = value; } } public override OMV.Vector3 Position { get { /* NOTE: this refetch is not necessary. The simulator knows about linkset children * and does not fetch this position info for children. Thus this is commented out. // child prims move around based on their parent. Need to get the latest location if (!Linkset.IsRoot(this)) _position = Linkset.PositionGet(this); */ // don't do the GetObjectPosition for root elements because this function is called a zillion times. // _position = BulletSimAPI.GetObjectPosition2(PhysicsScene.World.ptr, BSBody.ptr); return _position; } set { // If the position must be forced into the physics engine, use ForcePosition. // All positions are given in world positions. if (_position == value) { DetailLog("{0},BSPrim.setPosition,taint,positionNotChanging,pos={1},orient={2}", LocalID, _position, _orientation); return; } _position = value; PositionSanityCheck(false); // A linkset might need to know if a component information changed. Linkset.UpdateProperties(this, false); PhysicsScene.TaintedObject("BSPrim.setPosition", delegate() { DetailLog("{0},BSPrim.SetPosition,taint,pos={1},orient={2}", LocalID, _position, _orientation); ForcePosition = _position; }); } } public override OMV.Vector3 ForcePosition { get { _position = BulletSimAPI.GetPosition2(PhysBody.ptr); return _position; } set { _position = value; if (PhysBody.HasPhysicalBody) { BulletSimAPI.SetTranslation2(PhysBody.ptr, _position, _orientation); ActivateIfPhysical(false); } } } // Check that the current position is sane and, if not, modify the position to make it so. // Check for being below terrain and being out of bounds. // Returns 'true' of the position was made sane by some action. private bool PositionSanityCheck(bool inTaintTime) { bool ret = false; if (!PhysicsScene.TerrainManager.IsWithinKnownTerrain(_position)) { // The physical object is out of the known/simulated area. // Upper levels of code will handle the transition to other areas so, for // the time, we just ignore the position. return ret; } float terrainHeight = PhysicsScene.TerrainManager.GetTerrainHeightAtXYZ(_position); OMV.Vector3 upForce = OMV.Vector3.Zero; if (RawPosition.Z < terrainHeight) { DetailLog("{0},BSPrim.PositionAdjustUnderGround,call,pos={1},terrain={2}", LocalID, _position, terrainHeight); float targetHeight = terrainHeight + (Size.Z / 2f); // Upforce proportional to the distance away from the terrain. Correct the error in 1 sec. upForce.Z = (terrainHeight - RawPosition.Z) * 1f; ret = true; } if ((CurrentCollisionFlags & CollisionFlags.BS_FLOATS_ON_WATER) != 0) { float waterHeight = PhysicsScene.TerrainManager.GetWaterLevelAtXYZ(_position); // TODO: a floating motor so object will bob in the water if (Math.Abs(RawPosition.Z - waterHeight) > 0.1f) { // Upforce proportional to the distance away from the water. Correct the error in 1 sec. upForce.Z = (waterHeight - RawPosition.Z) * 1f; ret = true; } } // The above code computes a force to apply to correct any out-of-bounds problems. Apply same. // TODO: This should be intergrated with a geneal physics action mechanism. // TODO: This should be moderated with PID'ness. if (ret) { // Apply upforce and overcome gravity. OMV.Vector3 correctionForce = upForce - PhysicsScene.DefaultGravity; DetailLog("{0},BSPrim.PositionSanityCheck,applyForce,pos={1},upForce={2},correctionForce={3}", LocalID, _position, upForce, correctionForce); AddForce(correctionForce, false, inTaintTime); } return ret; } // Return the effective mass of the object. // The definition of this call is to return the mass of the prim. // If the simulator cares about the mass of the linkset, it will sum it itself. public override float Mass { get { return _mass; } } // used when we only want this prim's mass and not the linkset thing public override float RawMass { get { return _mass; } } // Set the physical mass to the passed mass. // Note that this does not change _mass! public override void UpdatePhysicalMassProperties(float physMass, bool inWorld) { if (PhysBody.HasPhysicalBody) { if (IsStatic) { BulletSimAPI.SetGravity2(PhysBody.ptr, PhysicsScene.DefaultGravity); Inertia = OMV.Vector3.Zero; BulletSimAPI.SetMassProps2(PhysBody.ptr, 0f, Inertia); BulletSimAPI.UpdateInertiaTensor2(PhysBody.ptr); } else { OMV.Vector3 grav = ComputeGravity(); if (inWorld) { // Changing interesting properties doesn't change proxy and collision cache // information. The Bullet solution is to re-add the object to the world // after parameters are changed. BulletSimAPI.RemoveObjectFromWorld2(PhysicsScene.World.ptr, PhysBody.ptr); } // The computation of mass props requires gravity to be set on the object. BulletSimAPI.SetGravity2(PhysBody.ptr, grav); Inertia = BulletSimAPI.CalculateLocalInertia2(PhysShape.ptr, physMass); BulletSimAPI.SetMassProps2(PhysBody.ptr, physMass, Inertia); BulletSimAPI.UpdateInertiaTensor2(PhysBody.ptr); // center of mass is at the zero of the object // DEBUG DEBUG BulletSimAPI.SetCenterOfMassByPosRot2(PhysBody.ptr, ForcePosition, ForceOrientation); DetailLog("{0},BSPrim.UpdateMassProperties,mass={1},localInertia={2},grav={3},inWorld={4}", LocalID, physMass, Inertia, grav, inWorld); if (inWorld) { BulletSimAPI.AddObjectToWorld2(PhysicsScene.World.ptr, PhysBody.ptr); } // Must set gravity after it has been added to the world because, for unknown reasons, // adding the object resets the object's gravity to world gravity BulletSimAPI.SetGravity2(PhysBody.ptr, grav); } } } // Return what gravity should be set to this very moment private OMV.Vector3 ComputeGravity() { OMV.Vector3 ret = PhysicsScene.DefaultGravity; if (!IsStatic) ret *= (1f - Buoyancy); return ret; } // Is this used? public override OMV.Vector3 CenterOfMass { get { return Linkset.CenterOfMass; } } // Is this used? public override OMV.Vector3 GeometricCenter { get { return Linkset.GeometricCenter; } } public override OMV.Vector3 Force { get { return _force; } set { _force = value; if (_force != OMV.Vector3.Zero) { // If the force is non-zero, it must be reapplied each tick because // Bullet clears the forces applied last frame. RegisterPreStepAction("BSPrim.setForce", LocalID, delegate(float timeStep) { DetailLog("{0},BSPrim.setForce,preStep,force={1}", LocalID, _force); if (PhysBody.HasPhysicalBody) { BulletSimAPI.ApplyCentralForce2(PhysBody.ptr, _force); ActivateIfPhysical(false); } } ); } else { UnRegisterPreStepAction("BSPrim.setForce", LocalID); } } } public override int VehicleType { get { return (int)_vehicle.Type; // if we are a vehicle, return that type } set { Vehicle type = (Vehicle)value; PhysicsScene.TaintedObject("setVehicleType", delegate() { // Done at taint time so we're sure the physics engine is not using the variables // Vehicle code changes the parameters for this vehicle type. _vehicle.ProcessTypeChange(type); ActivateIfPhysical(false); // If an active vehicle, register the vehicle code to be called before each step if (_vehicle.Type == Vehicle.TYPE_NONE) UnRegisterPreStepAction("BSPrim.Vehicle", LocalID); else RegisterPreStepAction("BSPrim.Vehicle", LocalID, _vehicle.Step); }); } } public override void VehicleFloatParam(int param, float value) { PhysicsScene.TaintedObject("BSPrim.VehicleFloatParam", delegate() { _vehicle.ProcessFloatVehicleParam((Vehicle)param, value); ActivateIfPhysical(false); }); } public override void VehicleVectorParam(int param, OMV.Vector3 value) { PhysicsScene.TaintedObject("BSPrim.VehicleVectorParam", delegate() { _vehicle.ProcessVectorVehicleParam((Vehicle)param, value); ActivateIfPhysical(false); }); } public override void VehicleRotationParam(int param, OMV.Quaternion rotation) { PhysicsScene.TaintedObject("BSPrim.VehicleRotationParam", delegate() { _vehicle.ProcessRotationVehicleParam((Vehicle)param, rotation); ActivateIfPhysical(false); }); } public override void VehicleFlags(int param, bool remove) { PhysicsScene.TaintedObject("BSPrim.VehicleFlags", delegate() { _vehicle.ProcessVehicleFlags(param, remove); }); } // Allows the detection of collisions with inherently non-physical prims. see llVolumeDetect for more public override void SetVolumeDetect(int param) { bool newValue = (param != 0); if (_isVolumeDetect != newValue) { _isVolumeDetect = newValue; PhysicsScene.TaintedObject("BSPrim.SetVolumeDetect", delegate() { // DetailLog("{0},setVolumeDetect,taint,volDetect={1}", LocalID, _isVolumeDetect); SetObjectDynamic(true); }); } return; } public override OMV.Vector3 Velocity { get { return _velocity; } set { _velocity = value; PhysicsScene.TaintedObject("BSPrim.setVelocity", delegate() { // DetailLog("{0},BSPrim.SetVelocity,taint,vel={1}", LocalID, _velocity); ForceVelocity = _velocity; }); } } public override OMV.Vector3 ForceVelocity { get { return _velocity; } set { PhysicsScene.AssertInTaintTime("BSPrim.ForceVelocity"); _velocity = value; if (PhysBody.HasPhysicalBody) { BulletSimAPI.SetLinearVelocity2(PhysBody.ptr, _velocity); ActivateIfPhysical(false); } } } public override OMV.Vector3 Torque { get { return _torque; } set { _torque = value; if (_torque != OMV.Vector3.Zero) { // If the torque is non-zero, it must be reapplied each tick because // Bullet clears the forces applied last frame. RegisterPreStepAction("BSPrim.setTorque", LocalID, delegate(float timeStep) { if (PhysBody.HasPhysicalBody) AddAngularForce(_torque, false, true); } ); } else { UnRegisterPreStepAction("BSPrim.setTorque", LocalID); } // DetailLog("{0},BSPrim.SetTorque,call,torque={1}", LocalID, _torque); } } public override float CollisionScore { get { return _collisionScore; } set { _collisionScore = value; } } public override OMV.Vector3 Acceleration { get { return _acceleration; } set { _acceleration = value; } } public override OMV.Quaternion RawOrientation { get { return _orientation; } set { _orientation = value; } } public override OMV.Quaternion Orientation { get { /* NOTE: this refetch is not necessary. The simulator knows about linkset children * and does not fetch this position info for children. Thus this is commented out. // Children move around because tied to parent. Get a fresh value. if (!Linkset.IsRoot(this)) { _orientation = Linkset.OrientationGet(this); } */ return _orientation; } set { if (_orientation == value) return; _orientation = value; // A linkset might need to know if a component information changed. Linkset.UpdateProperties(this, false); PhysicsScene.TaintedObject("BSPrim.setOrientation", delegate() { if (PhysBody.HasPhysicalBody) { // _position = BulletSimAPI.GetObjectPosition2(PhysicsScene.World.ptr, BSBody.ptr); // DetailLog("{0},BSPrim.setOrientation,taint,pos={1},orient={2}", LocalID, _position, _orientation); BulletSimAPI.SetTranslation2(PhysBody.ptr, _position, _orientation); } }); } } // Go directly to Bullet to get/set the value. public override OMV.Quaternion ForceOrientation { get { _orientation = BulletSimAPI.GetOrientation2(PhysBody.ptr); return _orientation; } set { _orientation = value; BulletSimAPI.SetTranslation2(PhysBody.ptr, _position, _orientation); } } public override int PhysicsActorType { get { return _physicsActorType; } set { _physicsActorType = value; } } public override bool IsPhysical { get { return _isPhysical; } set { if (_isPhysical != value) { _isPhysical = value; PhysicsScene.TaintedObject("BSPrim.setIsPhysical", delegate() { DetailLog("{0},setIsPhysical,taint,isPhys={1}", LocalID, _isPhysical); SetObjectDynamic(true); // whether phys-to-static or static-to-phys, the object is not moving. ZeroMotion(true); }); } } } // An object is static (does not move) if selected or not physical public override bool IsStatic { get { return _isSelected || !IsPhysical; } } // An object is solid if it's not phantom and if it's not doing VolumeDetect public override bool IsSolid { get { return !IsPhantom && !_isVolumeDetect; } } // Make gravity work if the object is physical and not selected // Called at taint-time!! private void SetObjectDynamic(bool forceRebuild) { // Recreate the physical object if necessary CreateGeomAndObject(forceRebuild); } // Convert the simulator's physical properties into settings on BulletSim objects. // There are four flags we're interested in: // IsStatic: Object does not move, otherwise the object has mass and moves // isSolid: other objects bounce off of this object // isVolumeDetect: other objects pass through but can generate collisions // collisionEvents: whether this object returns collision events private void UpdatePhysicalParameters() { // DetailLog("{0},BSPrim.UpdatePhysicalParameters,entry,body={1},shape={2}", LocalID, BSBody, BSShape); // Mangling all the physical properties requires the object not be in the physical world. // This is a NOOP if the object is not in the world (BulletSim and Bullet ignore objects not found). BulletSimAPI.RemoveObjectFromWorld2(PhysicsScene.World.ptr, PhysBody.ptr); // Set up the object physicalness (does gravity and collisions move this object) MakeDynamic(IsStatic); // Update vehicle specific parameters (after MakeDynamic() so can change physical parameters) _vehicle.Refresh(); // Arrange for collision events if the simulator wants them EnableCollisions(SubscribedEvents()); // Make solid or not (do things bounce off or pass through this object). MakeSolid(IsSolid); BulletSimAPI.AddObjectToWorld2(PhysicsScene.World.ptr, PhysBody.ptr); // TODO: Fix this. Total kludge because adding object to world resets its gravity to default. // Replace this when the new AddObjectToWorld function is complete. BulletSimAPI.SetGravity2(PhysBody.ptr, ComputeGravity()); // Rebuild its shape BulletSimAPI.UpdateSingleAabb2(PhysicsScene.World.ptr, PhysBody.ptr); // Collision filter can be set only when the object is in the world PhysBody.ApplyCollisionMask(); // Recompute any linkset parameters. // When going from non-physical to physical, this re-enables the constraints that // had been automatically disabled when the mass was set to zero. // For compound based linksets, this enables and disables interactions of the children. Linkset.Refresh(this); DetailLog("{0},BSPrim.UpdatePhysicalParameters,taintExit,static={1},solid={2},mass={3},collide={4},cf={5:X},body={6},shape={7}", LocalID, IsStatic, IsSolid, Mass, SubscribedEvents(), CurrentCollisionFlags, PhysBody, PhysShape); } // "Making dynamic" means changing to and from static. // When static, gravity does not effect the object and it is fixed in space. // When dynamic, the object can fall and be pushed by others. // This is independent of its 'solidness' which controls what passes through // this object and what interacts with it. private void MakeDynamic(bool makeStatic) { if (makeStatic) { // Become a Bullet 'static' object type CurrentCollisionFlags = BulletSimAPI.AddToCollisionFlags2(PhysBody.ptr, CollisionFlags.CF_STATIC_OBJECT); // Stop all movement ZeroMotion(true); // Set various physical properties so other object interact properly MaterialAttributes matAttrib = BSMaterials.GetAttributes(Material, false); BulletSimAPI.SetFriction2(PhysBody.ptr, matAttrib.friction); BulletSimAPI.SetRestitution2(PhysBody.ptr, matAttrib.restitution); // Mass is zero which disables a bunch of physics stuff in Bullet UpdatePhysicalMassProperties(0f, false); // Set collision detection parameters if (BSParam.CcdMotionThreshold > 0f) { BulletSimAPI.SetCcdMotionThreshold2(PhysBody.ptr, BSParam.CcdMotionThreshold); BulletSimAPI.SetCcdSweptSphereRadius2(PhysBody.ptr, BSParam.CcdSweptSphereRadius); } // The activation state is 'disabled' so Bullet will not try to act on it. // BulletSimAPI.ForceActivationState2(PhysBody.ptr, ActivationState.DISABLE_SIMULATION); // Start it out sleeping and physical actions could wake it up. BulletSimAPI.ForceActivationState2(PhysBody.ptr, ActivationState.ISLAND_SLEEPING); // This collides like a static object PhysBody.collisionType = CollisionType.Static; // There can be special things needed for implementing linksets Linkset.MakeStatic(this); } else { // Not a Bullet static object CurrentCollisionFlags = BulletSimAPI.RemoveFromCollisionFlags2(PhysBody.ptr, CollisionFlags.CF_STATIC_OBJECT); // Set various physical properties so other object interact properly MaterialAttributes matAttrib = BSMaterials.GetAttributes(Material, true); BulletSimAPI.SetFriction2(PhysBody.ptr, matAttrib.friction); BulletSimAPI.SetRestitution2(PhysBody.ptr, matAttrib.restitution); // per http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?t=3382 // Since this can be called multiple times, only zero forces when becoming physical // BulletSimAPI.ClearAllForces2(BSBody.ptr); // For good measure, make sure the transform is set through to the motion state BulletSimAPI.SetTranslation2(PhysBody.ptr, _position, _orientation); // Center of mass is at the center of the object // DEBUG DEBUG BulletSimAPI.SetCenterOfMassByPosRot2(Linkset.LinksetRoot.PhysBody.ptr, _position, _orientation); // A dynamic object has mass UpdatePhysicalMassProperties(RawMass, false); // Set collision detection parameters if (BSParam.CcdMotionThreshold > 0f) { BulletSimAPI.SetCcdMotionThreshold2(PhysBody.ptr, BSParam.CcdMotionThreshold); BulletSimAPI.SetCcdSweptSphereRadius2(PhysBody.ptr, BSParam.CcdSweptSphereRadius); } // Various values for simulation limits BulletSimAPI.SetDamping2(PhysBody.ptr, BSParam.LinearDamping, BSParam.AngularDamping); BulletSimAPI.SetDeactivationTime2(PhysBody.ptr, BSParam.DeactivationTime); BulletSimAPI.SetSleepingThresholds2(PhysBody.ptr, BSParam.LinearSleepingThreshold, BSParam.AngularSleepingThreshold); BulletSimAPI.SetContactProcessingThreshold2(PhysBody.ptr, BSParam.ContactProcessingThreshold); // This collides like an object. PhysBody.collisionType = CollisionType.Dynamic; // Force activation of the object so Bullet will act on it. // Must do the ForceActivationState2() to overcome the DISABLE_SIMULATION from static objects. BulletSimAPI.ForceActivationState2(PhysBody.ptr, ActivationState.ACTIVE_TAG); // There might be special things needed for implementing linksets. Linkset.MakeDynamic(this); } } // "Making solid" means that other object will not pass through this object. // To make transparent, we create a Bullet ghost object. // Note: This expects to be called from the UpdatePhysicalParameters() routine as // the functions after this one set up the state of a possibly newly created collision body. private void MakeSolid(bool makeSolid) { CollisionObjectTypes bodyType = (CollisionObjectTypes)BulletSimAPI.GetBodyType2(PhysBody.ptr); if (makeSolid) { // Verify the previous code created the correct shape for this type of thing. if ((bodyType & CollisionObjectTypes.CO_RIGID_BODY) == 0) { m_log.ErrorFormat("{0} MakeSolid: physical body of wrong type for solidity. id={1}, type={2}", LogHeader, LocalID, bodyType); } CurrentCollisionFlags = BulletSimAPI.RemoveFromCollisionFlags2(PhysBody.ptr, CollisionFlags.CF_NO_CONTACT_RESPONSE); } else { if ((bodyType & CollisionObjectTypes.CO_GHOST_OBJECT) == 0) { m_log.ErrorFormat("{0} MakeSolid: physical body of wrong type for non-solidness. id={1}, type={2}", LogHeader, LocalID, bodyType); } CurrentCollisionFlags = BulletSimAPI.AddToCollisionFlags2(PhysBody.ptr, CollisionFlags.CF_NO_CONTACT_RESPONSE); // Change collision info from a static object to a ghosty collision object PhysBody.collisionType = CollisionType.VolumeDetect; } } // Enable physical actions. Bullet will keep sleeping non-moving physical objects so // they need waking up when parameters are changed. // Called in taint-time!! private void ActivateIfPhysical(bool forceIt) { if (IsPhysical && PhysBody.HasPhysicalBody) BulletSimAPI.Activate2(PhysBody.ptr, forceIt); } // Turn on or off the flag controlling whether collision events are returned to the simulator. private void EnableCollisions(bool wantsCollisionEvents) { if (wantsCollisionEvents) { CurrentCollisionFlags = BulletSimAPI.AddToCollisionFlags2(PhysBody.ptr, CollisionFlags.BS_SUBSCRIBE_COLLISION_EVENTS); } else { CurrentCollisionFlags = BulletSimAPI.RemoveFromCollisionFlags2(PhysBody.ptr, CollisionFlags.BS_SUBSCRIBE_COLLISION_EVENTS); } } // prims don't fly public override bool Flying { get { return _flying; } set { _flying = value; } } public override bool SetAlwaysRun { get { return _setAlwaysRun; } set { _setAlwaysRun = value; } } public override bool ThrottleUpdates { get { return _throttleUpdates; } set { _throttleUpdates = value; } } public bool IsPhantom { get { // SceneObjectPart removes phantom objects from the physics scene // so, although we could implement touching and such, we never // are invoked as a phantom object return false; } } public override bool FloatOnWater { set { _floatOnWater = value; PhysicsScene.TaintedObject("BSPrim.setFloatOnWater", delegate() { if (_floatOnWater) CurrentCollisionFlags = BulletSimAPI.AddToCollisionFlags2(PhysBody.ptr, CollisionFlags.BS_FLOATS_ON_WATER); else CurrentCollisionFlags = BulletSimAPI.RemoveFromCollisionFlags2(PhysBody.ptr, CollisionFlags.BS_FLOATS_ON_WATER); }); } } public override OMV.Vector3 RotationalVelocity { get { return _rotationalVelocity; } set { _rotationalVelocity = value; // m_log.DebugFormat("{0}: RotationalVelocity={1}", LogHeader, _rotationalVelocity); PhysicsScene.TaintedObject("BSPrim.setRotationalVelocity", delegate() { DetailLog("{0},BSPrim.SetRotationalVel,taint,rotvel={1}", LocalID, _rotationalVelocity); ForceRotationalVelocity = _rotationalVelocity; }); } } public override OMV.Vector3 ForceRotationalVelocity { get { return _rotationalVelocity; } set { _rotationalVelocity = value; if (PhysBody.HasPhysicalBody) { BulletSimAPI.SetAngularVelocity2(PhysBody.ptr, _rotationalVelocity); ActivateIfPhysical(false); } } } public override bool Kinematic { get { return _kinematic; } set { _kinematic = value; // m_log.DebugFormat("{0}: Kinematic={1}", LogHeader, _kinematic); } } public override float Buoyancy { get { return _buoyancy; } set { _buoyancy = value; PhysicsScene.TaintedObject("BSPrim.setBuoyancy", delegate() { ForceBuoyancy = _buoyancy; }); } } public override float ForceBuoyancy { get { return _buoyancy; } set { _buoyancy = value; // DetailLog("{0},BSPrim.setForceBuoyancy,taint,buoy={1}", LocalID, _buoyancy); // Force the recalculation of the various inertia,etc variables in the object DetailLog("{0},BSPrim.ForceBuoyancy,buoy={1},mass={2}", LocalID, _buoyancy, _mass); UpdatePhysicalMassProperties(_mass, true); ActivateIfPhysical(false); } } // Used for MoveTo public override OMV.Vector3 PIDTarget { set { _PIDTarget = value; } } public override float PIDTau { set { _PIDTau = value; } } public override bool PIDActive { set { _usePID = value; } } // Used for llSetHoverHeight and maybe vehicle height // Hover Height will override MoveTo target's Z public override bool PIDHoverActive { set { _useHoverPID = value; } } public override float PIDHoverHeight { set { _PIDHoverHeight = value; } } public override PIDHoverType PIDHoverType { set { _PIDHoverType = value; } } public override float PIDHoverTau { set { _PIDHoverTao = value; } } // For RotLookAt public override OMV.Quaternion APIDTarget { set { return; } } public override bool APIDActive { set { return; } } public override float APIDStrength { set { return; } } public override float APIDDamping { set { return; } } public override void AddForce(OMV.Vector3 force, bool pushforce) { // Since this force is being applied in only one step, make this a force per second. OMV.Vector3 addForce = force / PhysicsScene.LastTimeStep; AddForce(addForce, pushforce, false); } // Applying a force just adds this to the total force on the object. // This added force will only last the next simulation tick. public void AddForce(OMV.Vector3 force, bool pushforce, bool inTaintTime) { // for an object, doesn't matter if force is a pushforce or not if (force.IsFinite()) { float magnitude = force.Length(); if (magnitude > BSParam.MaxAddForceMagnitude) { // Force has a limit force = force / magnitude * BSParam.MaxAddForceMagnitude; } OMV.Vector3 addForce = force; DetailLog("{0},BSPrim.addForce,call,force={1}", LocalID, addForce); PhysicsScene.TaintedObject(inTaintTime, "BSPrim.AddForce", delegate() { // Bullet adds this central force to the total force for this tick DetailLog("{0},BSPrim.addForce,taint,force={1}", LocalID, addForce); if (PhysBody.HasPhysicalBody) { BulletSimAPI.ApplyCentralForce2(PhysBody.ptr, addForce); ActivateIfPhysical(false); } }); } else { m_log.WarnFormat("{0}: Got a NaN force applied to a prim. LocalID={1}", LogHeader, LocalID); return; } } public override void AddAngularForce(OMV.Vector3 force, bool pushforce) { AddAngularForce(force, pushforce, false); } public void AddAngularForce(OMV.Vector3 force, bool pushforce, bool inTaintTime) { if (force.IsFinite()) { OMV.Vector3 angForce = force; PhysicsScene.TaintedObject(inTaintTime, "BSPrim.AddAngularForce", delegate() { if (PhysBody.HasPhysicalBody) { BulletSimAPI.ApplyTorque2(PhysBody.ptr, angForce); ActivateIfPhysical(false); } }); } else { m_log.WarnFormat("{0}: Got a NaN force applied to a prim. LocalID={1}", LogHeader, LocalID); return; } } // A torque impulse. // ApplyTorqueImpulse adds torque directly to the angularVelocity. // AddAngularForce accumulates the force and applied it to the angular velocity all at once. // Computed as: angularVelocity += impulse * inertia; public void ApplyTorqueImpulse(OMV.Vector3 impulse, bool inTaintTime) { OMV.Vector3 applyImpulse = impulse; PhysicsScene.TaintedObject(inTaintTime, "BSPrim.ApplyTorqueImpulse", delegate() { if (PhysBody.HasPhysicalBody) { BulletSimAPI.ApplyTorqueImpulse2(PhysBody.ptr, applyImpulse); ActivateIfPhysical(false); } }); } public override void SetMomentum(OMV.Vector3 momentum) { // DetailLog("{0},BSPrim.SetMomentum,call,mom={1}", LocalID, momentum); } #region Mass Calculation private float CalculateMass() { float volume = _size.X * _size.Y * _size.Z; // default float tmp; float returnMass = 0; float hollowAmount = (float)BaseShape.ProfileHollow * 2.0e-5f; float hollowVolume = hollowAmount * hollowAmount; switch (BaseShape.ProfileShape) { case ProfileShape.Square: // default box if (BaseShape.PathCurve == (byte)Extrusion.Straight) { if (hollowAmount > 0.0) { switch (BaseShape.HollowShape) { case HollowShape.Square: case HollowShape.Same: break; case HollowShape.Circle: hollowVolume *= 0.78539816339f; break; case HollowShape.Triangle: hollowVolume *= (0.5f * .5f); break; default: hollowVolume = 0; break; } volume *= (1.0f - hollowVolume); } } else if (BaseShape.PathCurve == (byte)Extrusion.Curve1) { //a tube volume *= 0.78539816339e-2f * (float)(200 - BaseShape.PathScaleX); tmp= 1.0f -2.0e-2f * (float)(200 - BaseShape.PathScaleY); volume -= volume*tmp*tmp; if (hollowAmount > 0.0) { hollowVolume *= hollowAmount; switch (BaseShape.HollowShape) { case HollowShape.Square: case HollowShape.Same: break; case HollowShape.Circle: hollowVolume *= 0.78539816339f;; break; case HollowShape.Triangle: hollowVolume *= 0.5f * 0.5f; break; default: hollowVolume = 0; break; } volume *= (1.0f - hollowVolume); } } break; case ProfileShape.Circle: if (BaseShape.PathCurve == (byte)Extrusion.Straight) { volume *= 0.78539816339f; // elipse base if (hollowAmount > 0.0) { switch (BaseShape.HollowShape) { case HollowShape.Same: case HollowShape.Circle: break; case HollowShape.Square: hollowVolume *= 0.5f * 2.5984480504799f; break; case HollowShape.Triangle: hollowVolume *= .5f * 1.27323954473516f; break; default: hollowVolume = 0; break; } volume *= (1.0f - hollowVolume); } } else if (BaseShape.PathCurve == (byte)Extrusion.Curve1) { volume *= 0.61685027506808491367715568749226e-2f * (float)(200 - BaseShape.PathScaleX); tmp = 1.0f - .02f * (float)(200 - BaseShape.PathScaleY); volume *= (1.0f - tmp * tmp); if (hollowAmount > 0.0) { // calculate the hollow volume by it's shape compared to the prim shape hollowVolume *= hollowAmount; switch (BaseShape.HollowShape) { case HollowShape.Same: case HollowShape.Circle: break; case HollowShape.Square: hollowVolume *= 0.5f * 2.5984480504799f; break; case HollowShape.Triangle: hollowVolume *= .5f * 1.27323954473516f; break; default: hollowVolume = 0; break; } volume *= (1.0f - hollowVolume); } } break; case ProfileShape.HalfCircle: if (BaseShape.PathCurve == (byte)Extrusion.Curve1) { volume *= 0.52359877559829887307710723054658f; } break; case ProfileShape.EquilateralTriangle: if (BaseShape.PathCurve == (byte)Extrusion.Straight) { volume *= 0.32475953f; if (hollowAmount > 0.0) { // calculate the hollow volume by it's shape compared to the prim shape switch (BaseShape.HollowShape) { case HollowShape.Same: case HollowShape.Triangle: hollowVolume *= .25f; break; case HollowShape.Square: hollowVolume *= 0.499849f * 3.07920140172638f; break; case HollowShape.Circle: // Hollow shape is a perfect cyllinder in respect to the cube's scale // Cyllinder hollow volume calculation hollowVolume *= 0.1963495f * 3.07920140172638f; break; default: hollowVolume = 0; break; } volume *= (1.0f - hollowVolume); } } else if (BaseShape.PathCurve == (byte)Extrusion.Curve1) { volume *= 0.32475953f; volume *= 0.01f * (float)(200 - BaseShape.PathScaleX); tmp = 1.0f - .02f * (float)(200 - BaseShape.PathScaleY); volume *= (1.0f - tmp * tmp); if (hollowAmount > 0.0) { hollowVolume *= hollowAmount; switch (BaseShape.HollowShape) { case HollowShape.Same: case HollowShape.Triangle: hollowVolume *= .25f; break; case HollowShape.Square: hollowVolume *= 0.499849f * 3.07920140172638f; break; case HollowShape.Circle: hollowVolume *= 0.1963495f * 3.07920140172638f; break; default: hollowVolume = 0; break; } volume *= (1.0f - hollowVolume); } } break; default: break; } float taperX1; float taperY1; float taperX; float taperY; float pathBegin; float pathEnd; float profileBegin; float profileEnd; if (BaseShape.PathCurve == (byte)Extrusion.Straight || BaseShape.PathCurve == (byte)Extrusion.Flexible) { taperX1 = BaseShape.PathScaleX * 0.01f; if (taperX1 > 1.0f) taperX1 = 2.0f - taperX1; taperX = 1.0f - taperX1; taperY1 = BaseShape.PathScaleY * 0.01f; if (taperY1 > 1.0f) taperY1 = 2.0f - taperY1; taperY = 1.0f - taperY1; } else { taperX = BaseShape.PathTaperX * 0.01f; if (taperX < 0.0f) taperX = -taperX; taperX1 = 1.0f - taperX; taperY = BaseShape.PathTaperY * 0.01f; if (taperY < 0.0f) taperY = -taperY; taperY1 = 1.0f - taperY; } volume *= (taperX1 * taperY1 + 0.5f * (taperX1 * taperY + taperX * taperY1) + 0.3333333333f * taperX * taperY); pathBegin = (float)BaseShape.PathBegin * 2.0e-5f; pathEnd = 1.0f - (float)BaseShape.PathEnd * 2.0e-5f; volume *= (pathEnd - pathBegin); // this is crude aproximation profileBegin = (float)BaseShape.ProfileBegin * 2.0e-5f; profileEnd = 1.0f - (float)BaseShape.ProfileEnd * 2.0e-5f; volume *= (profileEnd - profileBegin); returnMass = _density * volume; /* Comment out code that computes the mass of the linkset. That is done in the Linkset class. if (IsRootOfLinkset) { foreach (BSPrim prim in _childrenPrims) { returnMass += prim.CalculateMass(); } } */ returnMass = Util.Clamp(returnMass, BSParam.MinimumObjectMass, BSParam.MaximumObjectMass); return returnMass; }// end CalculateMass #endregion Mass Calculation // Rebuild the geometry and object. // This is called when the shape changes so we need to recreate the mesh/hull. // Called at taint-time!!! public void CreateGeomAndObject(bool forceRebuild) { // If this prim is part of a linkset, we must remove and restore the physical // links if the body is rebuilt. bool needToRestoreLinkset = false; bool needToRestoreVehicle = false; // Create the correct physical representation for this type of object. // Updates PhysBody and PhysShape with the new information. // Ignore 'forceRebuild'. This routine makes the right choices and changes of necessary. PhysicsScene.Shapes.GetBodyAndShape(false, PhysicsScene.World, this, null, delegate(BulletBody dBody) { // Called if the current prim body is about to be destroyed. // Remove all the physical dependencies on the old body. // (Maybe someday make the changing of BSShape an event to be subscribed to by BSLinkset, ...) needToRestoreLinkset = Linkset.RemoveBodyDependencies(this); needToRestoreVehicle = _vehicle.RemoveBodyDependencies(this); }); if (needToRestoreLinkset) { // If physical body dependencies were removed, restore them Linkset.RestoreBodyDependencies(this); } if (needToRestoreVehicle) { // If physical body dependencies were removed, restore them _vehicle.RestoreBodyDependencies(this); } // Make sure the properties are set on the new object UpdatePhysicalParameters(); return; } // The physics engine says that properties have updated. Update same and inform // the world that things have changed. // TODO: do we really need to check for changed? Maybe just copy values and call RequestPhysicsterseUpdate() enum UpdatedProperties { Position = 1 << 0, Rotation = 1 << 1, Velocity = 1 << 2, Acceleration = 1 << 3, RotationalVel = 1 << 4 } const float ROTATION_TOLERANCE = 0.01f; const float VELOCITY_TOLERANCE = 0.001f; const float POSITION_TOLERANCE = 0.05f; const float ACCELERATION_TOLERANCE = 0.01f; const float ROTATIONAL_VELOCITY_TOLERANCE = 0.01f; public override void UpdateProperties(EntityProperties entprop) { // Updates only for individual prims and for the root object of a linkset. if (Linkset.IsRoot(this)) { // A temporary kludge to suppress the rotational effects introduced on vehicles by Bullet // TODO: handle physics introduced by Bullet with computed vehicle physics. if (_vehicle.IsActive) { entprop.RotationalVelocity = OMV.Vector3.Zero; } // Assign directly to the local variables so the normal set action does not happen _position = entprop.Position; _orientation = entprop.Rotation; _velocity = entprop.Velocity; _acceleration = entprop.Acceleration; _rotationalVelocity = entprop.RotationalVelocity; // The sanity check can change the velocity and/or position. if (IsPhysical && PositionSanityCheck(true)) { entprop.Position = _position; entprop.Velocity = _velocity; } OMV.Vector3 direction = OMV.Vector3.UnitX * _orientation; // DEBUG DEBUG DEBUG DetailLog("{0},BSPrim.UpdateProperties,call,pos={1},orient={2},dir={3},vel={4},rotVel={5}", LocalID, _position, _orientation, direction, _velocity, _rotationalVelocity); // remember the current and last set values LastEntityProperties = CurrentEntityProperties; CurrentEntityProperties = entprop; base.RequestPhysicsterseUpdate(); } /* else { // For debugging, report the movement of children DetailLog("{0},BSPrim.UpdateProperties,child,pos={1},orient={2},vel={3},accel={4},rotVel={5}", LocalID, entprop.Position, entprop.Rotation, entprop.Velocity, entprop.Acceleration, entprop.RotationalVelocity); } */ // The linkset implimentation might want to know about this. Linkset.UpdateProperties(this, true); } } }